EP1002323B1 - Coating which is resistant to partial discharges, for enamelled wire - Google Patents
Coating which is resistant to partial discharges, for enamelled wire Download PDFInfo
- Publication number
- EP1002323B1 EP1002323B1 EP98945126A EP98945126A EP1002323B1 EP 1002323 B1 EP1002323 B1 EP 1002323B1 EP 98945126 A EP98945126 A EP 98945126A EP 98945126 A EP98945126 A EP 98945126A EP 1002323 B1 EP1002323 B1 EP 1002323B1
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- EP
- European Patent Office
- Prior art keywords
- coating
- wire
- wire enamel
- coating according
- titanium dioxide
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/303—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302
- H01B3/306—Polyimides or polyesterimides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/308—Wires with resins
Definitions
- the present invention relates to a new coating for enameled wires with at least one wire coating composition containing conventional Wire enamel binders as well as additives to the partial discharge resistance to improve the enameled wire prepared from the paint.
- Coatings for enameled wires often have a two-or multilayer structure with at least one base coat layer and at least one topcoat layer.
- wire coating agents commonly used today
- solutions of typical binders such as for example, polyester.
- After application and curing gives good adhesion, thermal and mechanical full-fledged paint films.
- the polymers of these films themselves are only little resistant to partial discharges starting from a certain Field strength occur on the wire surface.
- EP 0 768 680 and EP 0 768 679 describe enameled wires containing as binder component for the wire enamel a thioether acrylate silane prepared from tris (2-hydroxyethyl) isocyanurate triacrylate, 3-mercaptopropylmethyldimethoxysilane, tetraethoxysilane and SiO 2 as filler.
- the partial discharge strength is described as good. The thermal and mechanical properties are unlikely to match a standard paint wire at all.
- EP 356929 and US Pat. No. 4,935,302 describe formulations which, with different binders, contain as fillers Cr 2 O 3 or Fe 2 O 3 . Both pigments have a high specific gravity and the formulations tend to sediment strongly, which leads to difficulties in painting and in the baked paint film to uneven distribution of the pigments.
- Formulations are described in US 4,760,296, US 4,493,873, US 4,537,804. which contain as pigment Al 2 O 3 .
- JP 59 17 63 63 a wire is described which consists of a nickel-plated Cu core, which is filled with a polyimide varnish calcined clay and mica powder, is painted. The procedure is consuming and the paint, because of the low solids of the polyimide, uneconomical.
- enameled wires which are monolayered with a TiO 2 -containing coating compositions. They are more stable against partial discharges than enameled wires, which are monolayered with appropriate TiO 2 -free coating agents, but their overall application properties profile leaves much to be desired.
- the object underlying the present invention is thus therein, a new coating for enameled wires with wire enamels, containing standard wire-coat binders, solvents, catalysts and additives, for To provide the disadvantages of the previously known Avoid coatings, easy and inexpensive to manufacture and is to be processed.
- wire enamels should be storage stable, good adhesion especially on copper wires, the highest possible heat pressure and show sufficient heat shock.
- the wire enamels the highest possible solids content at a for the Processing have favorable viscosity.
- Coating should significantly improve the partial discharge resistance should be achieved.
- a new coating which has at least one base coat layer and at least one topcoat, wherein at least one topcoat titanium dioxide containing the wire enamel low additions of fumed silica in an amount up to 20 wt .-%, based on Titanium dioxide, contains.
- the new coating consists of a base coat layer and a TiO 2 -containing topcoat layer by the wire enamel small additions of fumed silica in an amount up to 20 wt .-%, based on titanium dioxide.
- the TiO 2 -containing topcoat layer according to the invention is produced from a TiO 2 -containing wire enamel, in which a polyamideimide is used as binder, it being necessary to indicate that the invention relates not only to this wire enamel binder but also to polyester. Polyestermide, polyurethane resins, etc. extends. Polyamide-imides are known and described, for example, in US-A-3,554,984, DE-A-2,441,020, DE-A-25 56 523, DE-A-12 66 427 and DE-A-19 56 512.
- the preparation of the polyamide-imides is carried out in a known manner from polycarboxylic acids or their anhydrides, in which two carboxyl groups are in the vicinal position and which must have at least one further functional group and polyamines having at least one primary, capable of imide bond amino group. Instead of the amine group, an isocyanate group can be used to form the imide ring.
- the polyamide-imides can also be obtained by reacting polyamides, polyisocyanates containing at least two NCO groups, and cyclic dicarboxylic anhydrides containing at least one further condensable or additionable group.
- oxidic pigment for the wire coating according to the invention is Titanium dioxide used. Surprisingly, its use in the inventive formulation to no waste of thermal and mechanical properties of the wire enamel or the topcoat layer. It is equally surprising that a significant improvement in the life under conditions of partial discharge for the enamel wire film is achieved.
- Topcoat to be used wire enamel formulations 5 to 30 %
- titanium dioxide based on the organic binder.
- the invention to be used Wire coating agent 0.5 to 5.0 wt.% Of a phenolic resin or a melamine resin included. Contents of up to 4.0% by weight. Also proven have commercially available fluorinated Additives.
- the customary and known TiO 2 -free wire enamels can be used, which contain as binders polyester, Palyestermide, polyurethane resins or polyamide-imides.
- the painted wires were tested according to IEC 851. increase 0.069 - 0.074 mm Outer fiber strain 1 * d + 30% thermal shock 1 * d at 300 ° C OK thermal printing 370 ° C tg delta steep rise 194 ° C
- the property level corresponds to a commercial two-layer enameled wire.
- IEC Twist was used as the test specimen.
- the test voltage was 4.5 kV at 50 Hz (sinus).
- the Twist were stored at 140 ° C and the Time to failure determined.
- the average life of the coating according to the invention coated wires is about 43 times larger than the lifetime the wires that are reported with a conventional paint were.
Abstract
Description
Die vorliegende Erfindung betrifft eine neue Beschichtung für Lackdrähte mit mindestens einem Drahtbeschichtungsmittel, enthaltend übliche Drahtlackbindemittel sowie Zusätze um die Teilentladungsbeständigkeit des aus dem Lack hergestellten Lackdrahtes zu verbessern.The present invention relates to a new coating for enameled wires with at least one wire coating composition containing conventional Wire enamel binders as well as additives to the partial discharge resistance to improve the enameled wire prepared from the paint.
Beschichtungen für Lackdrähte haben häufig einen zwei- oder mehrschichtigen Aufbau mit mindestens einer Grundlackschicht und mindestens einer Decklackschicht.Coatings for enameled wires often have a two-or multilayer structure with at least one base coat layer and at least one topcoat layer.
Die heute üblicherweise hierfür eingesetzten Drahtbeschichtungsmittel stellen im allgemeinen Lösungen der typischen Bindemittel, wie beispielsweise Polyester. Polyesterimide, Polyurethanharze und Polyamidimiden in Lösemitteln, gegebenenfalls. in Kombination mit handelsüblichen Kohlenwasserstoffverschnitten dar. Nach dem Aufbringen und Aushärten erhält man gut haftende, thermisch und mechanisch vollwertige Lackfilme. Die Polymere dieser Filme selbst sind nur wenig beständig gegenüber Teilentladungen, die ab einer bestimmten Feldstärke an der Drahtoberfläche auftreten.The wire coating agents commonly used today In general, solutions of typical binders, such as for example, polyester. Polyesterimides, polyurethane resins and polyamideimides in solvents, if necessary. in combination with commercial hydrocarbon blends. After application and curing gives good adhesion, thermal and mechanical full-fledged paint films. The polymers of these films themselves are only little resistant to partial discharges starting from a certain Field strength occur on the wire surface.
Teilentladungen, die durch lokal auftretende hohe Feldstärken am Draht entstehen, zerstören den isolierenden Drahtlackfilm. Der Einbau von anorganischen Komponenten in den Polymerfilm führt zu einer Verlängerung der Lebensdauer, wohl durch die Vergleichmäßigung der Entladung. Diese Erkenntnis hat dazu geführt, daß verschiedene Lacksysteme, die mehr oder minder stark mit oxidischen Stoffen gefüllt sind, als Drahtlacke publiziert wurden. Partial discharges caused by locally high field strengths on the wire arise, destroy the insulating wire enamel film. The installation of inorganic components in the polymer film leads to a Extension of the life, probably by the equalization of the Discharge. This realization has led to various Paint systems that are more or less filled with oxidic substances are when wire enamels were published.
In der EP 0 768 680 und in der EP 0 768 679 werden Lackdrähte beschrieben die als Bindemittelkomponente für den Drahtlack ein Thioetheracrylatsilan, hergestellt aus Tris (2-hydroxyethyl)-isocyanurattriacrylat, 3-Mercaptopropylmethyldimethoxysilan, Tetraethoxysilan, sowie SiO2 als Füllstoff enthalten. Die Teilentladungsfestigkeit wird als gut beschrieben. Die thermischen und mechanischen Eigenschaften dürften einem Standardlackdraht überhaupt nicht entsprechen.EP 0 768 680 and EP 0 768 679 describe enameled wires containing as binder component for the wire enamel a thioether acrylate silane prepared from tris (2-hydroxyethyl) isocyanurate triacrylate, 3-mercaptopropylmethyldimethoxysilane, tetraethoxysilane and SiO 2 as filler. The partial discharge strength is described as good. The thermal and mechanical properties are unlikely to match a standard paint wire at all.
In der EP 356929 und in der US 4 935 302 werden Formulierungen beschrieben die, bei unterschiedlichen Bindemitteln, als Füllstoffe Cr2O3 oder Fe2O3 enthalten. Beide Pigmente haben ein hohes spezifische Gewicht und die Formulierungen neigen zu einer starken Sedimentation, was zu beim Lackieren zu Schwierigkeiten und im eingebrannten Lackfilm zur ungleichmäßigen Verteilung der Pigmente führt.EP 356929 and US Pat. No. 4,935,302 describe formulations which, with different binders, contain as fillers Cr 2 O 3 or Fe 2 O 3 . Both pigments have a high specific gravity and the formulations tend to sediment strongly, which leads to difficulties in painting and in the baked paint film to uneven distribution of the pigments.
In den US 4 760 296, US 4 493 873, US 4 537 804 werden Formulierungen beschrieben. die als Pigment Al2O3 enthalten. Die starke abrasive Wirkung des Oxids auf die Lackierdüsen, die in einer Lackiermaschine auf wenige mµ genau aufeinander eingestellt werden müssen, wirkt sich ungünstig auf die Rundheit der Drähte sowie auf die Oberflächengüte aus.Formulations are described in US 4,760,296, US 4,493,873, US 4,537,804. which contain as pigment Al 2 O 3 . The strong abrasive effect of the oxide on the spray nozzles, which must be set to a few mμ in a coating machine exactly to each other, has an unfavorable effect on the roundness of the wires and on the surface quality.
In der CA 1 168 857 wird ähnlich wie in der US 4 760 296 der Einsatz von Al2O3 beschrieben, wobei auch SiO2 zu Einsatz kommt. Es gilt das für die US 4 760 296 gesagte. The use of Al 2 O 3 is described in CA 1 168 857, similar to US Pat. No. 4,760,296, whereby SiO 2 is also used. The same applies to US Pat. No. 4,760,296.
In der JP 59 17 63 63 wird ein Draht beschrieben, der aus einem vernickelten Cu-Kern besteht, der mit einem Polyimidlack, gefüllt mit kalcinierter Tonerde und Glimmerpulver, lackiert ist. Das Verfahren ist aufwendig und der Lack, wegen des geringen Festkörpers des Polyimids, unwirtschaftlich.In JP 59 17 63 63 a wire is described which consists of a nickel-plated Cu core, which is filled with a polyimide varnish calcined clay and mica powder, is painted. The procedure is consuming and the paint, because of the low solids of the polyimide, uneconomical.
In der US 3 553 282 wird die Verwendung von silikonmodifizierten Polyamidocarbonsäuren beschrieben. Die erhalten polyimidbeschichteten Drähte sind für den normalen Einsatzzweck overengineert und außerdem extrem teuer.US 3,553,282 discloses the use of silicone-modified ones Polyamidocarboxylic acids described. The obtained polyimide-coated Wires are overengineered for normal use and as well extremely expensive.
In der WO 96/42089 werden Lackdrähte beschrieben, die mit einem TiO2-haltigen Beschichtungsmitteln einschichtig isoliert sind. Sie sind stabiler gegenüber Teilentladungen als Lackdrähte, welche mit entsprechenden TiO2-freien Beschichtungsmitteln einschichtig isoliert sind, indes läßt ihr anwendungstechnisches Eigenschaftsprofil insgesamt noch zu wünschen übrig.In WO 96/42089 enameled wires are described which are monolayered with a TiO 2 -containing coating compositions. They are more stable against partial discharges than enameled wires, which are monolayered with appropriate TiO 2 -free coating agents, but their overall application properties profile leaves much to be desired.
Die der vorliegenden Erfindung zugrundeliegende Aufgabe besteht somit darin, eine neue Beschichtung für Lackdrähte mit Drahtlacken, enthaltend übliche Drahtlackbindemittel, Lösemittel, Katalysatoren und Additive, zur Verfügung zu stellen, die die Nachteile der bisher bekannten Beschichtungen vermeidet, einfach und kostengünstig herzustellen und zu verarbeiten ist.The object underlying the present invention is thus therein, a new coating for enameled wires with wire enamels, containing standard wire-coat binders, solvents, catalysts and additives, for To provide the disadvantages of the previously known Avoid coatings, easy and inexpensive to manufacture and is to be processed.
Die für die Herstellung der erfindungsgemäßen Beschichtung verwendeten Drahtlacke sollten lagerstabil sein, eine gute Haftung insbesondere auf Kupferdrähten, einen möglichst hohen Wärmedruck sowie einen ausreichenden Wärmeschock ausweisen. Außerdem sollen die Drahtlacke einen möglichst hohen Festkörpergehalt bei einer für die Verarbeitung günstigen Viskosität aufweisen. Mit der erfindungsgemäßen Beschichtung sollte eine erhebliche Verbesserung der Teilentladungsbeständigkeit sollte erzielt werden.The for the production of the coating according to the invention used wire enamels should be storage stable, good adhesion especially on copper wires, the highest possible heat pressure and show sufficient heat shock. In addition, should the wire enamels the highest possible solids content at a for the Processing have favorable viscosity. With the invention Coating should significantly improve the partial discharge resistance should be achieved.
Diese Aufgabe wird überraschend durch dadurch gelöst, daß man eine neue Beschichtung verwendet, welche mindestens eine Grundlackschicht und mindestens eine Decklackschicht aufweist, wobei mindestens eine Decklackschicht Titandioxid enthält der Drahtlack geringe Zusätze pyrogener Kieselsäure in einer Menge bis zu 20 Gew.-%, bezogen auf Titandioxid, enthält. Vorteilhafterweise besteht die neue Beschichtung aus einer Grundlackschicht und einer TiO2-haltigen Decklackschicht indem der Drahtlack geringe Zusätze pyrogener Kieselsäure in einer Menge bis zu 20 Gew.-%, bezogen auf Titandioxid, enthält.This object is achieved by surprisingly by using a new coating which has at least one base coat layer and at least one topcoat, wherein at least one topcoat titanium dioxide containing the wire enamel low additions of fumed silica in an amount up to 20 wt .-%, based on Titanium dioxide, contains. Advantageously, the new coating consists of a base coat layer and a TiO 2 -containing topcoat layer by the wire enamel small additions of fumed silica in an amount up to 20 wt .-%, based on titanium dioxide.
Die erfindungswesentliche TiO2-haltige Decklackschicht wird aus einem TiO2-haltigen Drahtlack hergestellt, worin als Bindemittel ein Polyamidimid verwendet wird, wobei der Hinweis gemacht werden muß, daß sich die Erfindung nicht nur auf dieses Drahtlackbindemittel, sondern auch auf Polyester. Polyestermide, Polyurethanharze u.a. erstreckt. Polyamidimide sind bekannt und beispielsweise in US-A-3 554 984, DE-A-24 41 020, DE-A-25 56 523, DE-A-12 66 427 und DE-A-19 56 512 beschrieben. Die Herstellung der Polyamidimide erfolgt in bekannter Weise aus Polycarbonsäuren oder deren Anhydriden, bei denen zwei Carboxylgruppen in vicinaler Stellung stehen und die mindestens noch eine weitere funktionelle Gruppe besitzen müssen und aus Polyaminen mit wenigstens einer primären, zur Imidbindung fähigen Aminogruppe. Statt der Amingruppe kann eine Isocyanatgruppe zur Bildung des Imidringes verwendet werden. Die Polyamidimide können auch durch Umsetzung von Polyamiden, Polyisocyanaten, die mindestens zwei NCO-Gruppen enthalten, und cyclischen Dicarbonsäureanhydriden, die mindestens eine weitere kondensations- oder additionsfähige Gruppe enthalten, gewonnen werden.The TiO 2 -containing topcoat layer according to the invention is produced from a TiO 2 -containing wire enamel, in which a polyamideimide is used as binder, it being necessary to indicate that the invention relates not only to this wire enamel binder but also to polyester. Polyestermide, polyurethane resins, etc. extends. Polyamide-imides are known and described, for example, in US-A-3,554,984, DE-A-2,441,020, DE-A-25 56 523, DE-A-12 66 427 and DE-A-19 56 512. The preparation of the polyamide-imides is carried out in a known manner from polycarboxylic acids or their anhydrides, in which two carboxyl groups are in the vicinal position and which must have at least one further functional group and polyamines having at least one primary, capable of imide bond amino group. Instead of the amine group, an isocyanate group can be used to form the imide ring. The polyamide-imides can also be obtained by reacting polyamides, polyisocyanates containing at least two NCO groups, and cyclic dicarboxylic anhydrides containing at least one further condensable or additionable group.
Als oxidisches Pigment für die erfindungsgemäße Drahtbeschichtung wird Titandioxid eingesetzt. Überraschenderweise führt dessen Einsatz in der erfindungsgemäßen Formulierung zu keinem Abfall der thermischen und mechanischen Eigenschaften des Drahtlackes bzw. der Decklackschicht. Ebenso überraschend ist es, daß eine erhebliche Verbesserung der Lebensdauer unter Bedingungen der Teilentladung für den Lackdrahtfilm erzielt wird.As oxidic pigment for the wire coating according to the invention is Titanium dioxide used. Surprisingly, its use in the inventive formulation to no waste of thermal and mechanical properties of the wire enamel or the topcoat layer. It is equally surprising that a significant improvement in the life under conditions of partial discharge for the enamel wire film is achieved.
Vorzugsweise können die erfindungsgemäß für die Herstellung der Decklackschicht zu verwendenden Drahtlackformulierungen 5 bis 30 Gew.% Titandioxid, bezogen auf das organische Bindemittel, enthalten. Besonders bevorzugt sind 10 bis 20 Gew.%.Preferably, according to the invention for the production of Topcoat to be used wire enamel formulations 5 to 30 % By weight of titanium dioxide, based on the organic binder. Particularly preferred are 10 to 20 wt.%.
Vorteilhaft für das Sedimentationsverhalten des erfindungsgemäß zu verwendenden Drahtlacks haben sich geringe Zusätze von pyrogener Kieselsäure erwiesen. Vorzugsweise können in den erfindungsgemäß zu verwendenden Drahtlackformulierungen bis zu 20 Gew.% pyrogener Kieselsäure, bezogen auf das Titandioxid, enthalten sein. Besonders bevorzugt sind bis zu 10 Gew. % pyrogener Kieselsäure.Advantageous for the sedimentation behavior of the invention using wire enamels have low additions of pyrogenic Silica proved. Preferably, in the invention according to wire enamel formulations used up to 20 wt.% Pyrogenic Silica, based on the titanium dioxide, be included. Especially Preference is given to up to 10% by weight of pyrogenic silica.
Vorteilhafterweise können die erfindungsgemäß zu verwendenden Drahtbeschichtungsmittel 0,5 bis 5,0 Gew.% eines Phenolharzes oder eines Melaminharzes enthalten. Besonders vorteilhaft sind Gehalte von bis zu 4,0 Gew.%. Bewährt haben sich ebenfalls handelsübliche fluorierte Additive. Advantageously, the invention to be used Wire coating agent 0.5 to 5.0 wt.% Of a phenolic resin or a melamine resin included. Contents of up to 4.0% by weight. Also proven have commercially available fluorinated Additives.
Für die Herstellung der Grundlackschicht(en) der erfindungsgemäßen Beschichtungen können die üblichen und bekannten TiO2-freien Drahtlacke verwendet werden, welche als Bindemittel Polyester, Palyestermide, Polyurethanharze oder Polyamidimide enthalten.For the preparation of the base coat layer (s) of the coatings of the invention, the customary and known TiO 2 -free wire enamels can be used, which contain as binders polyester, Palyestermide, polyurethane resins or polyamide-imides.
Bei einer Temperatur von kleiner 30°C werden 38.5 g Trimellithsäureanhydrid, 60.0 g Diphenylmethandiisocyanat und 73.5 g N-Methylpyrrolidon gemischt. Mit 10°C pro Stunde wird auf 150°C hochgeheizt. Bei dieser Temperatur wird der Ansatz so lange gehalten, bis kein Kohlendioxid mehr entsteht. Das Reaktionsprodukt wird mit einem 2:1 Gemisch von N-Methylpyrrolidon und Xylol verdünnt. Der erhaltene Drahtlack hat einen Festkörpergehalt von 35% bei einer Viskosität von 700 mPas bei 23°C.At a temperature of less than 30 ° C, 38.5 g of trimellitic anhydride, 60.0 g of diphenylmethane diisocyanate and 73.5 g of N-methylpyrrolidone mixed. At 10 ° C per hour is heated to 150 ° C. at At this temperature, the batch is held until no Carbon dioxide is more. The reaction product is treated with a 2: 1 Diluted mixture of N-methylpyrrolidone and xylene. The obtained Wire enamel has a solids content of 35% at a viscosity of 700 mPas at 23 ° C.
25.10 g des Lackes aus Beispiel 1 werden mit 4.70 g eines handelsüblichen
Titandioxides und 0.48 g pyrogener Kieselsäure in einem in der
Lackindustrie üblichen Verfahren verpastet. Mit 64.4 g Lack aus Beispiel
1 wird aufgelackt und dann mit einem Gemisch aus N-Methylpyrrolidon
und Xylol auf Viskosität eingestellt.
Die lackierten Drähte wurden nach IEC 851 geprüft.
Das Eigenschaftsniveau entspricht einem handelsüblichen Zweischichtlackdraht. The property level corresponds to a commercial two-layer enameled wire.
Als Probekörper wurden IEC-Twiste verwendet. Die Prüfspannung betrug 4.5 kV bei 50 Hz (sinus). Die Twiste wurden bei 140°C gelagert und die Zeit bis zum Ausfall bestimmt.IEC Twist was used as the test specimen. The test voltage was 4.5 kV at 50 Hz (sinus). The Twist were stored at 140 ° C and the Time to failure determined.
Verglichen wurden Drähte, die mit einem konventionellen Decklack, z.B. aus Beispiel 1.1, hergestellt wurden, mit Drähten die die erfindungsgemäße Beschichtung mit einer Decklackschicht, hergestellt mit dem Decklack aus Beispiel 1.2. als Overcoat haben.Wires compared with a conventional topcoat, e.g. from Example 1.1, were prepared with wires according to the invention Coating with a topcoat made with the topcoat of Example 1.2. as overcoat.
Die mittlere Lebensdauer der mit der erfindungsgemäßen Beschichtung beschichteten Drähte ist etwa um den Faktor 43 größer als die Lebensdauer der Drähte die mit einem konventionellen Lack berichtet wurden.The average life of the coating according to the invention coated wires is about 43 times larger than the lifetime the wires that are reported with a conventional paint were.
Claims (10)
- Coating for enamelled wires comprising at least one base coat and at least one top coat, characterized in that at least one top coat comprises titanium dioxide and the wire enamel contains small additions of pyrogenic silica in an amount of up to 20% by weight, based on titanium dioxide.
- Coating according to Claim 1, characterized in that it consists of a base coat and of a top coat.
- Coating according to Claim 1 or 2, characterized in that the top coat can be produced from a wire enamel which contains from 5 to 30% by weight, based on binder, of titanium dioxide.
- Coating according to Claim 3, characterized in that the wire enamel contains from 10 to 20% by weight, based on binder, of titanium dioxide.
- Coating according to any of Claims 1 to 4, characterized in that the wire enamel contains up to 10% by weight, based on titanium dioxide, of pyrogenic silica.
- Coating according to any of Claims 1 to 5, characterized in that the wire enamel has a solids content of from 20 to 50% by weight.
- Coating according to any of Claims 1 to 6, characterized in that the wire enamel has a viscosity of from 200 to 2000 mPa.s at 23°C.
- Coating according to any of Claims 1 to 7, characterized in that the wire enamel contains from 0.5 to 5.0% by weight of a phenol resin or of a melamine resin.
- Coating according to Claim 8, characterized in that the wire enamel contains up to 4.0% by weight of a phenol resin or of a melamine resin.
- Enamelled wires comprising a coating according to any of Claims 1 to 9.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19734003 | 1997-08-06 | ||
| DE19734003 | 1997-08-06 | ||
| DE19813667 | 1998-03-27 | ||
| DE19813667 | 1998-03-27 | ||
| DE19832186A DE19832186A1 (en) | 1997-08-06 | 1998-07-17 | Partial discharge resistant coating for enamelled wires |
| DE19832186 | 1998-07-17 | ||
| PCT/EP1998/004783 WO1999008288A1 (en) | 1997-08-06 | 1998-07-31 | Coating which is resistant to partial discharges, for enamelled wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1002323A1 EP1002323A1 (en) | 2000-05-24 |
| EP1002323B1 true EP1002323B1 (en) | 2005-05-04 |
Family
ID=27217613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98945126A Expired - Lifetime EP1002323B1 (en) | 1997-08-06 | 1998-07-31 | Coating which is resistant to partial discharges, for enamelled wire |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6337442B1 (en) |
| EP (1) | EP1002323B1 (en) |
| JP (1) | JP2001512888A (en) |
| CN (1) | CN1133178C (en) |
| AT (1) | ATE294989T1 (en) |
| BR (1) | BR9811723A (en) |
| CA (1) | CA2297314A1 (en) |
| DE (1) | DE59812767D1 (en) |
| WO (1) | WO1999008288A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10041943A1 (en) * | 2000-08-25 | 2002-03-14 | Schenectady Int Inc | Polyamideimide resin solution and its use for the production of wire enamels |
| DE10223354A1 (en) * | 2002-05-25 | 2003-12-04 | Bosch Gmbh Robert | Fine wire for e.g. ignition coil winding, with insulation resisting partial breakdown, has primary insulation comprising lacquer coating |
| CN100394515C (en) * | 2004-04-29 | 2008-06-11 | 上海裕生特种线材有限公司 | Frequency changing electromagnetic wire and manufacturing method thereof |
| DE102005050428A1 (en) * | 2005-10-21 | 2007-04-26 | Altana Electrical Insulation Gmbh | Lubricant for enameled wires |
| JP2010015907A (en) * | 2008-07-04 | 2010-01-21 | Furukawa Electric Co Ltd:The | Insulated wire, and rotary device using the same |
| FR2962128B1 (en) | 2010-07-02 | 2013-06-14 | Prod Plastiques Performants Holding 3P Holding | PTFE MATERIAL WITH ANTI-CORONA EFFECT |
| EP2782103B1 (en) * | 2013-03-18 | 2019-06-19 | Schwering & Hasse Elektrodraht GmbH | Enameled wire |
| US10029887B2 (en) * | 2016-03-29 | 2018-07-24 | Otis Elevator Company | Electroless metal coating of load bearing member for elevator system |
| EP3511950A1 (en) * | 2018-01-16 | 2019-07-17 | Schwering & Hasse Elektrodraht GmbH | Enamelled wire |
| US11004575B2 (en) * | 2018-05-07 | 2021-05-11 | Essex Furukawa Magnet Wire Usa Llc | Magnet wire with corona resistant polyimide insulation |
| US11728067B2 (en) * | 2018-05-07 | 2023-08-15 | Essex Furukawa Magnet Wire Usa Llc | Magnet wire with flexible corona resistant insulation |
| CA3099386A1 (en) * | 2018-05-07 | 2019-11-14 | Essex Furukawa Magnet Wire Usa Llc. | Magnet wire with corona resistant polyimide insulation |
| US11352521B2 (en) * | 2018-05-07 | 2022-06-07 | Essex Furukawa Magnet Wire Usa Llc | Magnet wire with corona resistant polyamideimide insulation |
| US11728068B2 (en) * | 2018-05-07 | 2023-08-15 | Essex Furukawa Magnet Wire Usa Llc | Magnet wire with corona resistant polyimide insulation |
| US11705771B2 (en) * | 2019-05-06 | 2023-07-18 | Essex Furukawa Magnet Wire Usa Llc | Electric machines having insulation formed on laminated structures |
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| US3287311A (en) | 1963-01-03 | 1966-11-22 | Du Pont | Polyimide containing tio2, articles, and process of making |
| DE1266427B (en) | 1963-01-08 | 1968-04-18 | Bayer Ag | Process for the production of lacquer coatings based on polyisocyanates |
| US3554984A (en) | 1968-10-16 | 1971-01-12 | George Co P D | Polyamide-imide resins |
| US3553282A (en) | 1969-09-08 | 1971-01-05 | Gen Electric | Siloxane containing polyamide acid blends |
| BE758753A (en) | 1969-11-11 | 1971-04-16 | Bayer Ag | POLYAMIDE-IMIDE PREPARATION PROCESS |
| DE2441020C3 (en) | 1974-08-27 | 1982-01-07 | Basf Ag, 6700 Ludwigshafen | Process for the production of viscosity-stable polyamide-imide solutions |
| DE2556523C2 (en) | 1975-12-16 | 1982-03-18 | Basf Ag, 6700 Ludwigshafen | Aromatic polyamide imides |
| CA1168857A (en) | 1979-07-30 | 1984-06-12 | Don R. Johnston | Corona-resistant resin compositions |
| US4760296A (en) | 1979-07-30 | 1988-07-26 | General Electric Company | Corona-resistant insulation, electrical conductors covered therewith and dynamoelectric machines and transformers incorporating components of such insulated conductors |
| JPS5833458A (en) | 1981-08-07 | 1983-02-26 | イ−・アイ・デユポン・デ・ニモアス・アンド・カンパニ− | High-temperature heat seal film |
| EP0076579A1 (en) | 1981-10-07 | 1983-04-13 | Cable Technology Laboratories, Inc. | Insulation shield for a high-voltage cable |
| US4537804A (en) | 1982-05-05 | 1985-08-27 | General Electric Company | Corona-resistant wire enamel compositions and conductors insulated therewith |
| US4493873A (en) | 1982-05-05 | 1985-01-15 | General Electric Company | Corona-resistant wire enamel compositions and conductors insulated therewith |
| US4448918A (en) | 1982-10-15 | 1984-05-15 | Phillips Petroleum Company | Poly(arylene sulfide) composition containing titanium dioxide and 3-mercaptopropyltrimethoxysilane |
| JPS59176363A (en) | 1983-03-25 | 1984-10-05 | Hitachi Cable Ltd | Enameled wire having resistance to corona and overload |
| GB2161799B (en) * | 1984-07-20 | 1987-09-03 | Thorn Emi Domestic Appliances | Improvements in or relating to microporous, thermally-insulative material |
| SE457031B (en) | 1987-03-24 | 1988-11-21 | Asea Ab | ELECTRIC conductor is provided with a surrounding insulation comprising a layer of an organic polymer and the use of the conductor in a harrow. |
| SE461941B (en) | 1988-08-30 | 1990-04-09 | Asea Brown Boveri | ELECTRICAL conductor with a surround insulation and use of the conductor in a harness |
| US5104735A (en) * | 1988-09-12 | 1992-04-14 | Hamilton Chemical Corporation | Fire retardant coating composition |
| DE4344044A1 (en) | 1993-12-23 | 1995-06-29 | Abb Research Ltd | Electrical insulation material and method for producing an electrically insulated conductor |
| WO1996042089A1 (en) | 1995-06-08 | 1996-12-27 | Weijun Yin | Pulsed voltage surge resistant magnet wire |
| US5654095A (en) * | 1995-06-08 | 1997-08-05 | Phelps Dodge Industries, Inc. | Pulsed voltage surge resistant magnet wire |
| DE19538189A1 (en) | 1995-10-13 | 1997-04-17 | Abb Patent Gmbh | Wire and process for its manufacture |
| DE19538190A1 (en) | 1995-10-13 | 1997-04-17 | Abb Patent Gmbh | Wire and process for its manufacture |
-
1998
- 1998-07-31 CA CA002297314A patent/CA2297314A1/en not_active Abandoned
- 1998-07-31 AT AT98945126T patent/ATE294989T1/en not_active IP Right Cessation
- 1998-07-31 JP JP2000506660A patent/JP2001512888A/en active Pending
- 1998-07-31 US US09/485,060 patent/US6337442B1/en not_active Expired - Fee Related
- 1998-07-31 CN CN988079011A patent/CN1133178C/en not_active Expired - Fee Related
- 1998-07-31 DE DE59812767T patent/DE59812767D1/en not_active Expired - Fee Related
- 1998-07-31 BR BR9811723-8A patent/BR9811723A/en not_active Application Discontinuation
- 1998-07-31 EP EP98945126A patent/EP1002323B1/en not_active Expired - Lifetime
- 1998-07-31 WO PCT/EP1998/004783 patent/WO1999008288A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001512888A (en) | 2001-08-28 |
| EP1002323A1 (en) | 2000-05-24 |
| CN1133178C (en) | 2003-12-31 |
| CA2297314A1 (en) | 1999-02-18 |
| DE59812767D1 (en) | 2005-06-09 |
| CN1265771A (en) | 2000-09-06 |
| US6337442B1 (en) | 2002-01-08 |
| BR9811723A (en) | 2000-09-26 |
| WO1999008288A1 (en) | 1999-02-18 |
| ATE294989T1 (en) | 2005-05-15 |
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